<template>
  <div ref="iconSelectorRef" class="iconselect-container">
    <el-input v-model="inputValue" readonly placeholder="点击选择图标" @click="visible = !visible">
      <template #prepend>
        <svg-icon :icon-class="inputValue" />
      </template>
    </el-input>

    <el-popover shadow="none" :visible="visible" placement="bottom-end" trigger="click" width="400">
      <template #reference>
        <div class="iconselect" @click="visible = !visible">
          <i-ep-caret-top v-show="visible"></i-ep-caret-top>
          <i-ep-caret-bottom v-show="!visible"></i-ep-caret-bottom>
        </div>
      </template>

      <!-- 下拉选择弹窗 -->
      <div ref="iconSelectorDialogRef">
        <el-input v-model="filterValue" style="padding: 0.5rem" placeholder="搜索图标" clearable @input="handleFilter" />
        <el-divider border-style="dashed" />

        <el-scrollbar height="300px">
          <ul class="icon-list">
            <li v-for="(iconName, index) in filterIconNames" :key="index" class="icon-item" @click="handleSelect(iconName)">
              <el-tooltip :content="iconName" placement="bottom" effect="light">
                <svg-icon color="var(--el-text-color-regular)" :icon-class="iconName" />
              </el-tooltip>
            </li>
          </ul>
        </el-scrollbar>
      </div>
    </el-popover>
  </div>
</template>

<script setup lang="ts">
const props = defineProps({
  modelValue: {
    type: String,
    require: false,
    default: ''
  }
})

const emit = defineEmits(['update:modelValue'])
const inputValue = toRef(props, 'modelValue')

const visible = ref(false) // 弹窗显示状态

const allIconNames: string[] = [] // 所有的图标名称集合

const filterValue = ref('') // 筛选的值
const filterIconNames = ref<string[]>([]) // 过滤后的图标名称集合

const iconSelectorRef = ref()
const iconSelectorDialogRef = ref()
/**
 * icon 加载
 */
function loadIcons() {
  const icons = import.meta.glob('../../assets/icons/*.svg')
  for (const icon in icons) {
    const iconName = icon.split('assets/icons/')[1].split('.svg')[0]
    allIconNames.push(iconName)
  }
  filterIconNames.value = allIconNames
}

/**
 * icon 筛选
 */
function handleFilter() {
  if (filterValue.value) {
    filterIconNames.value = allIconNames.filter((iconName) => iconName.includes(filterValue.value))
  } else {
    filterIconNames.value = allIconNames
  }
}

/**
 * icon 选择
 */
function handleSelect(iconName: string) {
  emit('update:modelValue', iconName)
  visible.value = false
}

/**
 * 点击容器外的区域关闭弹窗 VueUse onClickOutside
 */
onClickOutside(iconSelectorRef, () => (visible.value = false), {
  ignore: [iconSelectorDialogRef]
})

onMounted(() => {
  loadIcons()
})
</script>

<style scoped lang="scss">
.el-divider--horizontal {
  margin: 10px auto !important;
}

.iconselect-container {
  position: relative;
  width: 400px;

  .iconselect {
    position: absolute;
    right: 10px;
    top: 0;
    height: 32px;
    line-height: 32px;
    cursor: pointer;
  }
}

.icon-list {
  display: flex;
  flex-wrap: wrap;
  padding-left: 10px;
  margin-top: 10px;

  .icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-items: center;
    width: 10%;
    padding: 5px;
    margin: 0 10px 10px 0;
    cursor: pointer;
    border: 1px solid #ccc;

    &:hover {
      color: var(--el-color-primary);
      border-color: var(--el-color-primary);
      transition: all 0.2s;
      transform: scaleX(1.1);
    }
  }
}
</style>
